Hi there, and welcome to the board. I am not sure how long you have had your vision problems, but if it is Optic Neuritis, it can last for a few days or for a few weeks.
Predinesone can leave you with many side effects: increased appetite, nervousness, dizziness, and blurred vision. So it is difficult at this time to determine if your vision problems are due to the Predinesone, the optic neuritis or similar disorder, or both.
Gary